# Copyright 2019 The LUCI Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


def _next(name):
  """Returns the next value in a sequence.

  Sequences are auto-incrementing integer counters living in the global
  interpreter state. They are useful for generating values unique within a
  single `lucicfg` run.

  Args:
    name: name of the sequence to increment. Required.

  Returns:
    A positive integer, a new one each call, in the increasing order.
  """
  return __native__.sequence_next(name)


sequence = struct(next = _next)
